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Essential Fish Habitat and Seasonal Constraints. Michael Ludwig Ocean & Coastal Consultants, Inc Dredging 2012 October 22-25, 2012. US Harbors with natural water depths for today's or tomorrow's vessels are anomalies. USACE / State Permitting Procedures are Intimidating!.

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essential fish habitat and seasonal constraints
Essential Fish Habitat and Seasonal Constraints

Michael Ludwig

Ocean & Coastal Consultants, Inc

Dredging 2012

October 22-25, 2012

slide2

US Harbors with natural water depths for today's or tomorrow's vessels are anomalies.

slide4

What is Essential Fish Habitat (EFH)?

  • Those waters and substrate necessary to fish for spawning, breeding, feeding or growth to maturity
slide6

Seasonal Constraints on projects are driven by resource & habitat impact concerns during seasonal activities.

In many areas data on impact risks to lifestages & habitats is limited but constraints impact ≈ 85 % of projects.

uncertainty
UNCERTAINTY
  • The Precautionary Principle asserts that if an action or policy has a suspected risk of causing harm, the action or policy is assumed harmful.
  • The burden of proof for no harm is on those proposing the action.
  • IF YOU CAN AVOID AN IMPACT DO SO. IF NOT, GET THE FACTS.
four level efh determination
Four-Level EFH Determination

1.Presence/absence data are available.

2. Habitat-related density data are available.

3. Habitat-related growth, reproduction, or survival rate are available.

  • Production by habitat for each species or life stage.

LITTLE DATA, LOTS OF UNCERTAINTY

habitats of particular concern more than 100 listed
Habitats of Particular Concern(more than 100 listed)
  • Rarity of habitat type
  • Nature of ecological function / value
  • Sensitivity to Degradation
  • Extent of Stress from Development
recent findings
Recent Findings

Operational restrictions have problems:

  • Environmental buckets are not always friendly.
  • Marine debris negates restrictions.
  • Haul speed controls can be counter productive.
  • Barge overflow has merit.
  • Silt curtains are nota simple solution
  • With TSS, don’t believe your lying eyes.
slide11

Plumes dissipated within 500 m w/ most settling within channel

  • Plume sediment occasionally settled on adjacent shoals (wind driven)
  • Observed natural TSS events of greater magnitude and duration (DAMOS #112)
sequential dredging w 3 species
Sequential Dredging w/ 3 Species
  • Winter flounder
  • Tautog (blackfish)
  • Northern quahog

Sequential Dredging

slide14

Other options:

►Acoustic data

►Long-term data

► Decant or precipitate

►Vibrate piles

►Bite the Bullet: impact a single year of area's resource

a comment query from the constituency
A Comment & Query From The Constituency

Thanks for the opportunity

Dredging 2012

Any

Questions?

slide16

PanaMax Redefined 2014*

* 160' by 1200' by 50.0' by 190' usable

v 107' by 965' by 39.5' by 190' Today